Core-pulling device



April 6, 1926. 1,579,938

' E. HOTTER CORE PULLING DEVICE Filed DSC. 17' 1924 3 Sheets-She't lum... mn

April 6, 1926.

E. HOTTER CORE PULLING DEVICE Filed Dec. 17, 1924 3 Sheets-Sheet 2 April6, 1926.

E. HOTTER CORE PULLING DEVICE Filed Dec. 17, 1924 3 SheetS-Shet I5Patented Apr. 6, 1926.

ED'WRD Homann, C F CHICAGO, ILLINOIS.

CORE-PLLING DEVICE.

Application filed December 17, 1924. Serial No. 7758,406.

To ZZ lwhom, t mag/cmwern:

yBe it known that I, EnwAnoIIo'rrEn, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented new and useful Improvements in Core-Pulling Devices, of whichthe following is a specification. v

'I his invention relates tocore pulling de vices for die castingmachines. f

Ilcretofore, in mostcases, cores have been pulled by hand. rIhis is anexpensive operation and requires. that the .dies be made larger thanordinarily required in` order to support, the rack Aand pinion pullingdevices heretofore employed. In casting with alum'inumor zinc basealloys andA with tin alloys, the metal on cooling shrinks on the cores,making it exceedingly diflicult to withdraw the cores from the castings,and unless the cores are withdrawn at the proper time during the coolingoperation it is impossible toy remove the cores without nielting lthecastings.

The main object of my invention is to provide a core puller soconstructed as to exert more power in 'pulling the eoresthan the devicesheretofore used and thus overcome sticking of the cores in the castingsby shrinkage of the latter. I

A further object of my invention is to provide a core puller enabling aplurality of cores to be pulled either simultaneously or independently.

Another object of my invention is to so coi'istruct the core puller thatit may accommodate cores arranged at different angles to the die moldand in different offset positions, thus making the puller adaptable foruniversal work.

A further object of my invention is to provide a simple and efficientconstruction which may be used in connection with most any type ofdie-casting machine.

The invention Consists further in the matters hereinafter described andclaimed.

In the accompanying drawings Figure 1 is a front view of a core pullerconstructed in accordance with my invention and showing the parts withthe cores in the die mold;

Figures 2 and 3 are horizontal and vertical sectional views,respectively, taken on lines 2`2 and 3 3, of Fig. 1.

Fie'ure 4 is a front view showing the cores withdrawn from the die mold;

Figure 5 is a View of the die mold to-show the guiding means;

Figure is a side view of the core puller;

Figure 7 is a top plan View thereof, the operating screw heilig shown insection;

Figure 8 is a view of one of the toggles to illustratie a detail ofconstruction; and

Figure 9 is a perspective of the. casting made by the die mold and coresshown in Figs. l and 2. y

In the drawings 1, 1 `indicate the two pairs of vertically spacedhorizontal supporting rods employed in a die-casting machine and onwhich rods is a power-operated slide 2.

The die mold construction is shown in Fig.`

@and as illustrated comprises two separable d ie members 3, 4. The diemember 3 is carried by a box 5 on the slide 2. In this box works thepushof plate G with its pins aud is similar to the structure shown anddescribed in my (zo-pending application Serial No. 7 51,779, tiledNovember 24, 1924.

The other die member 4 is carried by a box 7 on plate 2 which is heldstationary in the machine.

As shown in Figs. 1 and 5, the box 5 is provided on the outside with twolaterally projecting lugs 8,v 8. These lugs are arranged on oppositesides of the box and at opposite corners as shown. Said lugs carry guidepins 9, 9 and are adapted to enter holes 10,1() in the lugs 8a, 8a inthe other box 7 to guide the dies in the proper register when closingthe die. i

By having the guide pins 9, 9 outside of the die, the latter may be madesmaller than heretofore because,` it is not necessary to make the dielarge enough for the pins to pass through it, as heretofore employed.This also reduces the. expense of the construction by reducing theamo-unt of steel required for the die. Moreover, only two o-utsidefguidepins are required for each die construction instead of four inside pinsas heretofore.

In the drawings, I have shown the die so made as to produce the type ofcasting shown in Fig. 9. This casting has a. tubular body portion 11,and laterally projecting oliset bosses 12, 12 on opposite sides thereofwith one boss adjacent one end of the casting and the other adjacent onthe other end. For this type of casting three cores 13, 14, 14 areen'iployed. The core 1S is for the body part' 11 of the casting and thecores 14,

. end of a screw 18.

,the slide 15 is 14 are for the side bosses 12. These cores as shown inFigs. 1 and 4 are arranged with the cores 14.at right angles to thecorel 13 and at opposite sides thereo The core 13 is carried by a slide15, movable between guides 16, 16 mounted on the main slide 2 andadjustably secured thereto by bolts 17, 17. As shown in Figs. 6 and 7,provided on its rear side with to which is attachedlthe lower This screwextends through avthreaded boss 19 fixed to the main frame of the deviceso that on turning the hand-wheel 21 the slide 15 is moved to carry thecore 13 into and out^of the die. The hand-wheel 21 shown in Figs. 1 and4 is provided with a plurality of pins 2 2, which may be grasped by theoperator on turning the screw.

On opposite sides of the die are slides 23, 23 each connected with oneof the cores 14 a .boss 15 for moving these cores into and out of thedevice.

die mold. For each slide 23 there is a lever 24 fulcrumed on one of. theadjacent rods 1, as shown in Figs. 1 and 4. The lower end of each lever24'crosses its associated slide 23 and by a link 25 is connected withits slide. As shown in Fig. 6, the slide 23 by dovetail or equivalentmeans is connected with a supporting member 26 carried by the main slide24 are connected by toggle mechanisms with the slide 15 and guides 16,respectively. By this construction, the slides 23 may be moved with theslide 15 on actuation of the screw 18 to move the cores 13 and 14 intoand out of the die mold.

The toggle mechanism for each lever 24 embraces three links 27, 28 and29. These links have p-ivot-alconnection at their meeting ends. The link27 is pivoted to its lever 24, the link 28 to the slide 15, and the link29 to the associated guide 16 through a plate 30. Links 27 and 28 extendthrough blocks trunnioned on the'lever 24 and slide 15, respectively, sothat these links may pivot about these parts in the operation of the Thelinks are on center and are thus locked against accidental movement whenthe cores are in the die as shown in Fig. 1. On moving the slide 15upward the links break and cause the levers 24 to withdraw the cores 14from the die as shown in Fig. 4.

To regulate the movement of the cores' and thus control the distancethat the cores extend into the die, two collars 31, 32 are provided onthe screw 18 on opposite sides of a boss 19 forming a part of theupright frame 20, which also includes the guides 16. This screw has twosets of threads,- one on top of the other, with the main thread of acoarse pitch for moving the screw endwise. The fine pitch thread is forthe collars 31., 32. The collar 31 is split and has 2. The upper ends ofthe levers a clampscrew 33 for setting the collar on the screw. Thecollar 32 is slotted and carries a. set-screw 34 for tightening thecollaron the screw 18. After the cores have been brought to the properposition in the die the collar 31 is set on the screw 18 against the topof the boss 19 as shown in Fig. 6, and is then clamped to the screw. Thedevice is then operated to com letely withdraw the cores 13, 14=from theie and the collar 32 is then set up against the underside of the boss 19and clamped to the screw 18 so as to control the travel of the screw 18for the particular die for which the parts have been set. By these meansit is possible to set the travel of the screw 18 for different lengthsof cores.

The links 27, 28 are threaded and pass loosely through their. respectivetrunnion blocks 35 as shown. Each link is provided with two sets of nuts36, 36 on opposite sides of its block 35. lVhen these nuts are broughtagainst the blocks, the links are held against any endwise movementthrough the blocks in the actuation of the toggles. By adjusting thenuts on the links the travel of the cores 14, 14 may be accuratelyadjusted. By adjusting the nuts 36 away from the blocks 35 lost motion(Fig. 8) is provided in the toggle action, thereby permitting the'device to withdraw any particular core 0r set of cores from the -dieindependently of the action of the other core drawing parts. By thisconstruction the device may be used with cores having different lengthsand the cores moved in timed relation so as to withdraw all of them fromthe die either dependently or independently.

For the links 28 the blocks 35 are mounted between an outside plate 37and bracket lugs 38 on the slide as shown in Figs. 6 and 7.

i As shown in Figs. 1, 4 and 6, a block 39 is connected by dovetailforequivalent counection in the bottom of the slide 15 so that this blockmay have adjustment toward and from the main slide 2. A plurality of Tslots 40 are provided in the underside of the block 39 andthese slotsextend across the block transverse to its adjustment with the slide 15.Fixed to the upper side of the die box 5 there is a bracket 41 throughwhich the core 13 operates and has its upper end headed and received inone of the cross slots 40. The bracket 41 extends outward overv the diemember 3 so that the core'13 may enter the die. By having a plurality ofcross slots 40 the core 13 may be used with dies of different depths.The block 39 1s not clamped to the slide nor is the core 13 clamped tothe block, thus allowing the core to center itself with respect to thecavity in the die so that the core will be withdrawn straight out of thedie without binding against the casting, to crack it as frequentlyhappens in devices as heretofore used.

The lower end of each 'lever 24 is provided with anelongated slot 42 asshown in Fig. 6. The outer end of the link 25 ex- 'tends through thisslot and is pivotally connected with lugs or ears 43 on a plate 44clamped by bolts 45 to the lever 24 at the slot. ,'.lhe plate 44. isalso slotted for the outer end ot' the link to extend through, as shownin the drawings. The bolts 45 extend inward into the slot 42 and havethe heads at their inner ends in grooves 4G -in thejlever 24, as shownin the drawings.

As shown in Figs. 2 and the' inner end of each link 25 engages about abushing 47' on the associated bolt 48 carried by the slide 23. The innerend ot the buslnng engages teeth forn'ied in the slide 23 as shown,there,

being a clamp nut on the screw to hold the bushing from. slipping on theslide. This slide 23 is provided with a T yslot 49 to receive theheadedinner end ot the bolt 4S, so that adj ustlnent of the parts may bemade when required. .g

As shown in Fig. 2, the slide 23 is L- shaped and arranged with theright-angled part 50 extending outward from the main slide 2. A block 51has a dovetail or equivalent connection with the part 50 so as toV haveadjustment to and from the main slide This block is provided on itsfront side with a plurality ot' cross grooves 5la adapted to receive theheaded end of the associated core 14, by means of which the core isconnected with the slide for moving the core into and out of the. die.The core 14 moves through a bracket lug 52 on the box 5 in the samemanner as the structure described for the core 13. lVith the core 14adjustably connected' with its slide withoutv 'lo accommodate thischange in leveragel the plates 30 by bolts 55 having their heads in Tslots 5G in the guides 16. 1G may raise and lower the centers aboutwhich the links 29 move in the operation of the device. rlhe angleplates 26. 2G are secured to the sides ot' the main slide 21, bolts4.'37, 57 having their heads in T slots 58, 5S inthe slide 2 forvertical adjustment'.

lVhile I have shown and described herein in detail a core pulling deviceof my iuvention, it is of course to be understood that the details ofconstruction and arrangement of parts may be variously changed andmodified Without departing fronrthe spirit and scope of the same.

I claim as my invention:

1. In a die-casting machine, the combination with a die mold havingcores arranged about the saine, ot a core pulling device having'meanls`for movingsaid cores either simultaneously or independently into and outof the die mold,:md means for adjusting the extent of travel of thecores into the die mold.

2.k In a die-casting machine, the combination with a die mold having`cores arranged about the same, ot' a core pulling device having meanstor moving the cores either simultaneously or independently into and outot the die mold, and meansl for varying the power exerted by saiddevice.

In a die-casting machine, the combination with a die mold, oi'acorepulling device on said machine and having a plurality of cores arrangedabout the die mold, and means inrludin, r a toggle mechanisn'i and ascrew for moving the cores into and out of the die mold on the actuationof said screw.

4. In a dieeasting machine, the combination with a die mold, of a corepulling de-A vice on said machine and having levers for operating coreson opposite sides of the die mold, a toggle mechanism and an actuatingscrew lor n'ioving the levers to carry the cores into and out of thedieJ mold, said levers bein-g adjustable for varying the leverageexerted thereby on the cores.

5. In a die-casting machine, the combination with a die mold, of a corepullingdevice on said machine and having levers for operatingcores onopposite sides of the die mold, a toggle mechanism connected with saidlevers `for moving the cores into and out ot' Athe die mold, means forproviding lost motion in the action ot the toggles for regulating thetravel of the cores, and means for actuating the toggles.

6. In a die-casting machine, the combination with a pair of stationaryrods, of a die mold there-between, a core pulling device having a pairof levers fulerumed on said rods and operating cores on opposite sidesof the die mold, and a toggle mechanism for actuating the levers formoving the cores into and out of the die mold.

7. In a. die-casting machine, the combination with a die mold, ot a pairof' levers fulcrumed on the machine on opposite sides of the die moldfor moving cores into and out of the die mold, and a toggle mechanismfor actuating said levers. said mechanism heilig adjustable forregulating the locking action of the toggles.

8. In a die-casting machine, the combination with a die mold, ot' a mainslide, a pair of levers ulcrumed on the machine on op-A posite sides ofthe die mold tor moving the cores into and out of the same, and toggle let) l mechanism for actuating said levers "and having screw-tlireadedlinks extending loosely through blocks trunnioned on the levers andslide, respectively, clamp nuts on said links for providingA lost motionin the toggle action. l f v 9. In a die-casting machin-e, thecombination with a die mold, of a core pulling device including a leverfulci'umed on the machine and having one end at one side of the diemold, and means interposed between the lever Aand the' die mold forconverting the arcuate movement of the lever into a .straight linemovement for moving the core into and out oi the die mold.

10. In a die-casting machine, the combination with a die moldof a. corepulling device including` a lever fulciumed on the inachiiie and havingone end at one side of the die mold, a slide between the lever and thedie mold and engaged`witli a core, and a link connecting the lever totheslide for moving the core into and out of the die mold in the actuationof the lever. j

11. In a die-casting machine, the combinationwith a die mold, of a corepulling device including a lever fulcrumed on the machinefand having oneend at one side of the die mold, a slide between the die mold and leverand connected with a core, and a link connecting the slide to the leverfor moving the. core into and out of the die mold, said link having anadjustable connection with the slide.

12. In a die-casting machine, the combination with a die mold,.of a corepulling device including a lever iulcrumedion the machine and having anend at one side of the die mold,a slide between the lever and the diemold and connecting with a core, and a link connecting the slide to thelever for moving the core into and out of the die mold, said slidehaving an elongated slot to receive a bolt carried by the link with aseriated connection between the slide and the bolt for ladjusting thetravel of the core.

13. In a die-casting machine, the combination witha die-mold, of acarrying member therefor, a core pulling device associated therewith andhaving core operating slides opei'able in the saine plane and arranged.above andon opposite sides of the die-mold, -andmeans for mo'ving theslides either simultaneously or independently for moving the cores intoand outof the die mold.

14. In a die-casting machine, the combination with a core and "the diecarrying member, of a core pulling device including a slide vcarried bysaid member, and a block carrying said core and adjustably mounted onsaid slide to adjust the position of the l5. In a die-casting machine,the combination with the die carrying member, of a core pullingdevice-including a plurality of die and one above the saine, leversfulcrumed on the machine and connected with the slides on opposite sidesvof the die, a screw connected with the slide above the die for movingthe saine, a toggle mechanism operated by said screw and connected withsaid levers for operating the saine.

16. In a die-casting machine, the combination with the die moldconstruction having a core guide, ofa core pulling device including aslide for the core and a block carried by said slide and having a grooveto receive the outer end ot the 'core so that the Vcore may have acentering action on moving into the die mold through the guide.

17. ln a die-casting machine, the coinbination with the die carryingmember, of a core pulling device including a frame on saidmember, aslide in said frame and cai'- rying a core for the die, a screw having ashallow thread and a deep thread with the deep thread engaged with theboss on the frame and connected with the slide for actuating the same,adjusting members engaging the shallow thread lof the screw and on0pposite sides of the boss. for adjusting the travel of the screw.

l8.`In a die-casting machine, the combi-' nation with the die carryingmember, of a coi-e pulling device at said member andhaving a leverfulcrumed on said machine for moving a core into and out of the die, atoggle mechanism connected with said lever for moving the same, saidlever being adjustable to vary the leverage thereof and said togglemechanism having adjustable connection With a fixed part of the devicefor adjusting the toggle action to accommodate for the adjustment givento the lever.

19. In a die-casting machine, the combination with a die carryingmember, of a core pulling device including slides on said member andarranged about the die mold with coresconnected with said slides, atoggle mechanism and a screw for operating said slides, and a hand Wheelwith grab pins connected with said screw whereby the same may be turned.A

20. InV a die-casting machine, the combination ,with a die mold, of acore pulling device on the machine at said mold and including a leverfulcrumed on the machine, a slide'between the mold and lever andconnected with a core, a link between the slide and lever, said linkhaving its ends pivoted to the slides and lever, respectively, andhaving adjustable connection with said respective parts, and means foractuating said ever.

In testimony that I claim the foregoing as my invention, I afx mysignature, this 12th day of December, 1924. f

EDVARD HOTTER.

